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Citrus2011 [14]
2 years ago
13

Element X is a radioactive isotope such that every 66 years, its mass

Mathematics
1 answer:
LenKa [72]2 years ago
3 0

Answer:

194.5315427 grams

Step-by-step explanation:

The half-life of element x would be 66 years. So, after 20 years you would have:

.5^(20/66) x 240=0.810548 x 240

        =194.5315427 grams of the element left ......

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